/* =========================================================
   page-about ｜ 品牌概况
   作用域：.page-about
   继承 site_kit 设计令牌，专属变量在作用域内定义
   ========================================================= */

/* ---------- 作用域变量 ---------- */
.page-about {
  --about-hero-min-height: 480px;
  --about-hero-title-size: clamp(2.4rem, 6.5vw, 4.8rem);
  --about-stat-size: clamp(2rem, 4vw, 3.2rem);
  --about-card-radius: var(--radius-lg, 16px);
  --about-transition-flip: 0.55s cubic-bezier(0.23, 1, 0.32, 1);
}

/* ---------- 英雄区 ---------- */
.page-about .about-hero {
  position: relative;
  min-height: var(--about-hero-min-height);
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  padding: 2rem 0 3rem;
}

.page-about .about-hero__bg-wrap {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero__bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  display: block;
}

.page-about .about-hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(11,26,51,0.88) 0%, rgba(11,26,51,0.52) 70%, rgba(255,75,43,0.18) 100%);
  z-index: 1;
}

.page-about .about-hero .container {
  position: relative;
  z-index: 2;
  width: 100%;
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--clr-text-secondary, #B0C4DE);
  margin-bottom: 1.2rem;
  flex-wrap: wrap;
}

.page-about .breadcrumb__link {
  color: var(--clr-text-secondary, #B0C4DE);
  text-decoration: none;
  transition: color var(--transition-base);
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--clr-accent-orange-red, #FF4B2B);
}

.page-about .breadcrumb__sep {
  color: var(--clr-border-subtle, #2E4A6E);
  user-select: none;
}

.page-about .breadcrumb__current {
  color: var(--clr-text-primary, #FFFFFF);
  font-weight: 600;
}

/* 英雄区主体 */
.page-about .about-hero__body {
  max-width: 720px;
}

.page-about .about-hero__title {
  font-family: var(--font-heading);
  font-size: var(--about-hero-title-size);
  color: var(--clr-text-primary, #FFFFFF);
  line-height: 1.08;
  margin: 0 0 0.15rem;
  letter-spacing: -0.02em;
  text-shadow: 0 2px 12px rgba(0,0,0,0.4);
}

.page-about .about-hero__tagline {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--clr-accent-gold, #F5A623);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 0 0 0.8rem;
  opacity: 0.9;
}

.page-about .about-hero__desc {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  color: var(--clr-text-secondary, #B0C4DE);
  line-height: 1.7;
  margin: 0 0 1.8rem;
  max-width: 580px;
}

/* 数据墙 – 三个统计胶囊 */
.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-about .stat-pill {
  display: flex;
  align-items: center;
  gap: 0.4rem 0.6rem;
  background: var(--clr-surface-dark, #1A2A44);
  border: 1px solid var(--clr-border-subtle, #2E4A6E);
  border-radius: var(--radius-pill, 9999px);
  padding: 0.5rem 1.2rem 0.5rem 1rem;
  backdrop-filter: blur(4px);
  transition: border-color var(--transition-base);
}

.page-about .stat-pill:hover {
  border-color: var(--clr-accent-gold, #F5A623);
}

.page-about .stat-pill__num {
  font-family: var(--font-mono);
  font-size: var(--about-stat-size);
  font-weight: 700;
  color: var(--clr-accent-gold, #F5A623);
  line-height: 1;
}

.page-about .stat-pill__num--live {
  font-size: calc(var(--about-stat-size) * 0.7);
  letter-spacing: 0.05em;
  position: relative;
}

.page-about .stat-pill__num--live::before {
  content: "●";
  font-size: 0.5em;
  vertical-align: middle;
  margin-right: 0.3em;
  color: var(--clr-accent-orange-red, #FF4B2B);
  animation: about-pulse-dot 1.6s ease-in-out infinite;
}

@keyframes about-pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.page-about .stat-pill__label {
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--clr-text-secondary, #B0C4DE);
  white-space: nowrap;
}

/* 响应式：英雄区移动端 */
@media (max-width: 640px) {
  .page-about .about-hero {
    min-height: 360px;
    padding: 1.2rem 0 2rem;
    align-items: flex-end;
  }
  .page-about .about-hero__title {
    font-size: 2rem;
  }
  .page-about .about-hero__tagline {
    font-size: 0.8125rem;
  }
  .page-about .about-hero__desc {
    font-size: 0.9375rem;
  }
  .page-about .stat-pill {
    padding: 0.35rem 0.9rem 0.35rem 0.75rem;
  }
  .page-about .stat-pill__num {
    font-size: 1.4rem;
  }
}

/* ---------- 核心优势 – 翻转卡片 ---------- */
.page-about .about-advantages {
  padding: 4rem 0 3rem;
  background: var(--clr-primary-deep-blue, #0B1A33);
}

.page-about .about-advantages .section-title {
  margin-bottom: 2.5rem;
}

.page-about .advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

/* 翻转卡片容器 */
.page-about .advantage-card {
  perspective: 1200px;
  cursor: pointer;
  outline: none;
  height: 100%;
  min-height: 260px;
}

.page-about .advantage-card__inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform var(--about-transition-flip);
  border-radius: var(--about-card-radius);
}

.page-about .advantage-card:hover .advantage-card__inner,
.page-about .advantage-card:focus-within .advantage-card__inner {
  transform: rotateY(180deg);
}

/* 正面 & 背面 */
.page-about .advantage-card__front,
.page-about .advantage-card__back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--about-card-radius);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: var(--clr-surface-dark, #1A2A44);
  border: 1px solid var(--clr-border-subtle, #2E4A6E);
  transition: border-color var(--transition-base);
}

.page-about .advantage-card__front {
  align-items: center;
  text-align: center;
}

.page-about .advantage-card__back {
  transform: rotateY(180deg);
  align-items: flex-start;
  text-align: left;
  background: var(--clr-surface-medium, #14203A);
  border-color: var(--clr-accent-gold, #F5A623);
}

.page-about .advantage-card__icon {
  width: 64px;
  height: 64px;
  object-fit: contain;
  margin-bottom: 1rem;
  border-radius: 12px;
  background: var(--clr-surface-medium, #14203A);
  padding: 6px;
}

.page-about .advantage-card__heading {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  color: var(--clr-text-primary, #FFFFFF);
  margin: 0 0 0.4rem;
}

.page-about .advantage-card__brief {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--clr-text-secondary, #B0C4DE);
  margin: 0;
  line-height: 1.5;
}

.page-about .advantage-card__detail {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--clr-text-secondary, #B0C4DE);
  line-height: 1.7;
  margin: 0;
  position: relative;
  padding-left: 1rem;
  border-left: 3px solid var(--clr-accent-orange-red, #FF4B2B);
}

/* 响应式：核心优势 */
@media (max-width: 900px) {
  .page-about .advantages-grid {
    grid-template-columns: 1fr;
    gap: 1.2rem;
  }
  .page-about .advantage-card {
    min-height: 220px;
  }
  .page-about .advantage-card__front,
  .page-about .advantage-card__back {
    padding: 1.5rem 1.2rem;
  }
}

/* ---------- 合规信息 ---------- */
.page-about .about-compliance {
  padding: 4rem 0;
  background: var(--clr-surface-medium, #14203A);
}

.page-about .compliance-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 2rem;
  align-items: start;
}

.page-about .compliance-card {
  background: var(--clr-surface-dark, #1A2A44);
  border: 1px solid var(--clr-border-subtle, #2E4A6E);
  border-radius: var(--about-card-radius);
  padding: 2rem 2rem 1.8rem;
}

.page-about .compliance-list {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.page-about .compliance-list__item {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 0.6rem;
  font-family: var(--font-body);
  font-size: 0.9375rem;
}

.page-about .compliance-list__label {
  color: var(--clr-text-secondary, #B0C4DE);
  min-width: 3.2rem;
  font-weight: 500;
}

.page-about .compliance-list__value {
  color: var(--clr-text-primary, #FFFFFF);
  word-break: break-word;
}

.page-about .compliance-list__value a {
  color: var(--clr-accent-gold, #F5A623);
  text-decoration: none;
  transition: color var(--transition-base);
}

.page-about .compliance-list__value a:hover {
  color: var(--clr-accent-orange-red, #FF4B2B);
}

/* ICP 折叠区 */
.page-about .compliance-details {
  margin-bottom: 1.2rem;
  border: 1px solid var(--clr-border-subtle, #2E4A6E);
  border-radius: var(--radius-pill, 9999px);
  overflow: hidden;
  transition: border-color var(--transition-base);
}

.page-about .compliance-details[open] {
  border-radius: var(--radius-lg, 16px);
  border-color: var(--clr-accent-gold, #F5A623);
}

.page-about .compliance-details__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.7rem 1.2rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--clr-text-primary, #FFFFFF);
  background: var(--clr-surface-medium, #14203A);
  transition: background var(--transition-base);
}

.page-about .compliance-details__summary::-webkit-details-marker {
  display: none;
}

.page-about .compliance-details__summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.2rem;
  color: var(--clr-accent-orange-red, #FF4B2B);
  transition: transform var(--transition-base);
}

.page-about .compliance-details[open] .compliance-details__summary::after {
  transform: rotate(45deg);
}

.page-about .compliance-details__summary:hover {
  background: var(--clr-primary-deep-blue, #0B1A33);
}

.page-about .compliance-details__label {
  font-weight: 500;
}

.page-about .compliance-details__badge {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
}

.page-about .compliance-details__body {
  padding: 0.8rem 1.2rem 1rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--clr-text-secondary, #B0C4DE);
  line-height: 1.6;
  border-top: 1px solid var(--clr-border-subtle, #2E4A6E);
}

.page-about .compliance-details__body strong {
  color: var(--clr-accent-gold, #F5A623);
}

/* 注意说明 */
.page-about .compliance-note {
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--clr-text-secondary, #B0C4DE);
  line-height: 1.6;
  margin: 0;
  padding: 0.6rem 0 0;
  border-top: 1px dashed var(--clr-border-subtle, #2E4A6E);
}

/* 地标视觉区 */
.page-about .compliance-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.8rem;
}

.page-about .compliance-visual__img {
  width: 100%;
  max-width: 400px;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--about-card-radius);
  border: 1px solid var(--clr-border-subtle, #2E4A6E);
  box-shadow: 0 4px 24px rgba(0,0,0,0.3);
}

.page-about .compliance-visual__credit {
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--clr-accent-gold, #F5A623);
  letter-spacing: 0.04em;
  text-align: center;
}

/* 响应式：合规信息 */
@media (max-width: 768px) {
  .page-about .compliance-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .page-about .compliance-card {
    padding: 1.5rem;
  }
  .page-about .compliance-visual__img {
    max-width: 100%;
  }
}

/* ---------- 了解更多 ---------- */
.page-about .about-links {
  padding: 4rem 0;
  background: var(--clr-primary-deep-blue, #0B1A33);
}

.page-about .about-links .section-title {
  margin-bottom: 2rem;
}

.page-about .links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 1rem;
}

.page-about .links-grid__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  padding: 1.4rem 0.8rem;
  background: var(--clr-surface-dark, #1A2A44);
  border: 1px solid var(--clr-border-subtle, #2E4A6E);
  border-radius: var(--about-card-radius);
  text-decoration: none;
  color: var(--clr-text-primary, #FFFFFF);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  transition: all var(--transition-base);
}

.page-about .links-grid__item:hover,
.page-about .links-grid__item:focus-visible {
  border-color: var(--clr-accent-orange-red, #FF4B2B);
  transform: translateY(-4px);
  box-shadow: 0 8px 28px rgba(255,75,43,0.15);
}

.page-about .links-grid__icon {
  font-size: 1.6rem;
  line-height: 1;
  color: var(--clr-accent-gold, #F5A623);
  transition: color var(--transition-base);
}

.page-about .links-grid__item:hover .links-grid__icon {
  color: var(--clr-accent-orange-red, #FF4B2B);
}

.page-about .links-grid__text {
  font-weight: 500;
  text-align: center;
}

/* 响应式：了解更多 */
@media (max-width: 480px) {
  .page-about .links-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }
  .page-about .links-grid__item {
    padding: 1rem 0.6rem;
  }
}

/* ---------- 通用辅助 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .advantage-card__inner {
    transition: none;
  }
  .page-about .advantage-card:hover .advantage-card__inner,
  .page-about .advantage-card:focus-within .advantage-card__inner {
    transform: none;
  }
  .page-about .advantage-card__back {
    transform: none;
    position: relative;
    backface-visibility: visible;
  }
  .page-about .advantage-card__front {
    position: relative;
    backface-visibility: visible;
  }
  .page-about .advantage-card {
    perspective: none;
  }
  .page-about .advantage-card__inner {
    transform-style: flat;
  }
  .page-about .stat-pill__num--live::before {
    animation: none;
  }
}